A printing error affecting more than one-third of the precincts in Los Angeles County left 118,522 registered voters off the rolls during the California primary on Tuesday, the county election authority said in a statement.

County Clerk Dean C. Logan said that voters left off the rolls can still cast provisional ballots. But the process of verifying and counting a large number of provisional ballots could delay the vote tally in local races, depending on exactly where the affected precincts are. Two battleground House seats, California’s 25th and 39th Districts, take in parts of Los Angeles County.

“We apologize for the inconvenience and concern this has caused,” Logan said in a statement Tuesday evening. “Voters should be assured their vote will be counted.”